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    <title>GNU GENERAL PUBLIC LICENSE</title>
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    <center><h1>GNU GENERAL PUBLIC LICENSE</h1><br>
      <i>Version 2, June 1991</i><br>
      Copyright &copy; 1989, 1991 Free Software Foundation, Inc.<br>
      59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    </center>

    <p>
      Everyone is permitted to copy and distribute verbatim copies of
      this license document, but changing it is not allowed.
    </p>

    <br>
    <center>Preamble</center>

    <p>
      The licenses for most software are designed to take away your
      freedom to share and change it.  By contrast, the GNU General
      Public License is intended to guarantee your freedom to share
      and change free software--to make sure the software is free for
      all its users.  This General Public License applies to most of
      the Free Software Foundation's software and to any other program
      whose authors commit to using it.  (Some other Free Software
      Foundation software is covered by the GNU Library General Public
      License instead.)  You can apply it to your programs, too.
    </p>

    <p>
      When we speak of free software, we are referring to freedom, not
      price.  Our General Public Licenses are designed to make sure
      that you have the freedom to distribute copies of free software
      (and charge for this service if you wish), that you receive
      source code or can get it if you want it, that you can change
      the software or use pieces of it in new free programs; and that
      you know you can do these things.
    </p>

    <p>
      To protect your rights, we need to make restrictions that forbid
      anyone to deny you these rights or to ask you to surrender the
      rights.  These restrictions translate to certain
      responsibilities for you if you distribute copies of the
      software, or if you modify it.
    </p>

    <p>
      For example, if you distribute copies of such a program, whether
      gratis or for a fee, you must give the recipients all the rights
      that you have.  You must make sure that they, too, receive or
      can get the source code.  And you must show them these terms so
      they know their rights.
    </p>

    <p>
      We protect your rights with two steps: (1) copyright the
      software, and (2) offer you this license which gives you legal
      permission to copy, distribute and/or modify the software.
    </p>

    <p>
      Also, for each author's protection and ours, we want to make
      certain that everyone understands that there is no warranty for
      this free software.  If the software is modified by someone else
      and passed on, we want its recipients to know that what they
      have is not the original, so that any problems introduced by
      others will not reflect on the original authors' reputations.
    </p>

    <p>
      Finally, any free program is threatened constantly by software
      patents.  We wish to avoid the danger that redistributors of a
      free program will individually obtain patent licenses, in effect
      making the program proprietary.  To prevent this, we have made
      it clear that any patent must be licensed for everyone's free
      use or not licensed at all.
    </p>

    <p>
      The precise terms and conditions for copying, distribution and
      modification follow.
      </p>

    <br>
    <center>GNU GENERAL PUBLIC LICENSE<br>
      TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
    </center>

    <p>
      0. This License applies to any program or other work which
      contains a notice placed by the copyright holder saying it may
      be distributed under the terms of this General Public License.
      The "Program", below, refers to any such program or work, and a
      "work based on the Program" means either the Program or any
      derivative work under copyright law: that is to say, a work
      containing the Program or a portion of it, either verbatim or
      with modifications and/or translated into another language.
      (Hereinafter, translation is included without limitation in the
      term "modification".)  Each licensee is addressed as "you".
    </p>

    <p>
      Activities other than copying, distribution and modification are
      not covered by this License; they are outside its scope.  The
      act of running the Program is not restricted, and the output
      from the Program is covered only if its contents constitute a
      work based on the Program (independent of having been made by
      running the Program).  Whether that is true depends on what the
      Program does.
      </p>

    <p>
      1. You may copy and distribute verbatim copies of the Program's
      source code as you receive it, in any medium, provided that you
      conspicuously and appropriately publish on each copy an
      appropriate copyright notice and disclaimer of warranty; keep
      intact all the notices that refer to this License and to the
      absence of any warranty; and give any other recipients of the
      Program a copy of this License along with the Program.
    </p>

    <p>
      You may charge a fee for the physical act of transferring a
      copy, and you may at your option offer warranty protection in
      exchange for a fee.
    </p>

    <p>
      2. You may modify your copy or copies of the Program or any
      portion of it, thus forming a work based on the Program, and
      copy and distribute such modifications or work under the terms
      of Section 1 above, provided that you also meet all of these
      conditions:
    </p>

    <dl>
      <dd><p>a) You must cause the modified files to carry prominent
	  notices stating that you changed the files and the date of any
	  change.
	</p>

	<br>
	
      <dd><p>b) You must cause any work that you distribute or
	  publish, that in whole or in part contains or is derived from
	  the Program or any part thereof, to be licensed as a whole at no
	  charge to all third parties under the terms of this License.
	</p>
	
	<br>
	
      <dd><p> c) If the modified program normally reads commands
	  interactively when run, you must cause it, when started running
	  for such interactive use in the most ordinary way, to print or
	  display an announcement including an appropriate copyright
	  notice and a notice that there is no warranty (or else, saying
	  that you provide a warranty) and that users may redistribute the
	  program under these conditions, and telling the user how to view
	  a copy of this License.  (Exception: if the Program itself is
	  interactive but does not normally print such an announcement,
	  your work based on the Program is not required to print an
	  announcement.)
	</p>

    </dl>
    
    <p>
      These requirements apply to the modified work as a whole.  If
      identifiable sections of that work are not derived from the
      Program, and can be reasonably considered independent and
      separate works in themselves, then this License, and its terms,
      do not apply to those sections when you distribute them as
      separate works.  But when you distribute the same sections as
      part of a whole which is a work based on the Program, the
      distribution of the whole must be on the terms of this License,
      whose permissions for other licensees extend to the entire
      whole, and thus to each and every part regardless of who wrote
      it.
    </p>

    <p>
      Thus, it is not the intent of this section to claim rights or
      contest your rights to work written entirely by you; rather, the
      intent is to exercise the right to control the distribution of
      derivative or collective works based on the Program.
    </p>

    <p>
      In addition, mere aggregation of another work not based on the
      Program with the Program (or with a work based on the Program)
      on a volume of a storage or distribution medium does not bring
      the other work under the scope of this License.
    </p>

    <p>
      3. You may copy and distribute the Program (or a work based on
      it, under Section 2) in object code or executable form under the
      terms of Sections 1 and 2 above provided that you also do one of
      the following:
    </p>

    <dl>

      <dd><p>a) Accompany it with the complete corresponding
	  machine-readable source code, which must be distributed under
	  the terms of Sections 1 and 2 above on a medium customarily used
	  for software interchange; or,
	</p>

	<br>
	
      <dd><p>b) Accompany it with a written offer, valid for at least
	  three years, to give any third party, for a charge no more than
	  your cost of physically performing source distribution, a
	  complete machine-readable copy of the corresponding source code,
	  to be distributed under the terms of Sections 1 and 2 above on a
	  medium customarily used for software interchange; or,
	</p>

	<br>
	
      <dd><p>c) Accompany it with the information you received as to
	  the offer to distribute corresponding source code.  (This
	  alternative is allowed only for noncommercial distribution and
	  only if you received the program in object code or executable
	  form with such an offer, in accord with Subsection b above.)
	</p>
	
    </dl>

    <p>
      The source code for a work means the preferred form of the work
      for making modifications to it.  For an executable work,
      complete source code means all the source code for all modules
      it contains, plus any associated interface definition files,
      plus the scripts used to control compilation and installation of
      the executable.  However, as a special exception, the source
      code distributed need not include anything that is normally
      distributed (in either source or binary form) with the major
      components (compiler, kernel, and so on) of the operating system
      on which the executable runs, unless that component itself
      accompanies the executable.
    </p>

    <p>
      If distribution of executable or object code is made by offering
      access to copy from a designated place, then offering equivalent
      access to copy the source code from the same place counts as
      distribution of the source code, even though third parties are
      not compelled to copy the source along with the object code.
    </p>
    
    <p>
      4. You may not copy, modify, sublicense, or distribute the
      Program except as expressly provided under this License.  Any
      attempt otherwise to copy, modify, sublicense or distribute the
      Program is void, and will automatically terminate your rights
      under this License.  However, parties who have received copies,
      or rights, from you under this License will not have their
      licenses terminated so long as such parties remain in full
      compliance.
      </p>

    <p>
      5. You are not required to accept this License, since you have
      not signed it.  However, nothing else grants you permission to
      modify or distribute the Program or its derivative works.  These
      actions are prohibited by law if you do not accept this License.
      Therefore, by modifying or distributing the Program (or any work
      based on the Program), you indicate your acceptance of this
      License to do so, and all its terms and conditions for copying,
      distributing or modifying the Program or works based on it.
    </p>
    
    <p>
      6. Each time you redistribute the Program (or any work based on
      the Program), the recipient automatically receives a license
      from the original licensor to copy, distribute or modify the
      Program subject to these terms and conditions.  You may not
      impose any further restrictions on the recipients' exercise of
      the rights granted herein.  You are not responsible for
      enforcing compliance by third parties to this License.
    </p>

    <p>
      7. If, as a consequence of a court judgment or allegation of
      patent infringement or for any other reason (not limited to
      patent issues), conditions are imposed on you (whether by court
      order, agreement or otherwise) that contradict the conditions of
      this License, they do not excuse you from the conditions of this
      License.  If you cannot distribute so as to satisfy
      simultaneously your obligations under this License and any other
      pertinent obligations, then as a consequence you may not
      distribute the Program at all.  For example, if a patent license
      would not permit royalty-free redistribution of the Program by
      all those who receive copies directly or indirectly through you,
      then the only way you could satisfy both it and this License
      would be to refrain entirely from distribution of the Program.
    </p>

    <p>
      If any portion of this section is held invalid or unenforceable
      under any particular circumstance, the balance of the section is
      intended to apply and the section as a whole is intended to
      apply in other circumstances.
    </p>

    <p>
      It is not the purpose of this section to induce you to infringe
      any patents or other property right claims or to contest
      validity of any such claims; this section has the sole purpose
      of protecting the integrity of the free software distribution
      system, which is implemented by public license practices.  Many
      people have made generous contributions to the wide range of
      software distributed through that system in reliance on
      consistent application of that system; it is up to the
      author/donor to decide if he or she is willing to distribute
      software through any other system and a licensee cannot impose
      that choice.
    </p>

    <p>
      This section is intended to make thoroughly clear what is
      believed to be a consequence of the rest of this License.
    </p>
    
    <p>
      8. If the distribution and/or use of the Program is restricted
      in certain countries either by patents or by copyrighted
      interfaces, the original copyright holder who places the Program
      under this License may add an explicit geographical distribution
      limitation excluding those countries, so that distribution is
      permitted only in or among countries not thus excluded.  In such
      case, this License incorporates the limitation as if written in
      the body of this License.
    </p>

    <p>
      9. The Free Software Foundation may publish revised and/or new
      versions of the General Public License from time to time.  Such
      new versions will be similar in spirit to the present version,
      but may differ in detail to address new problems or concerns.
    </p>

    <p>
      Each version is given a distinguishing version number.  If the
      Program specifies a version number of this License which applies
      to it and "any later version", you have the option of following
      the terms and conditions either of that version or of any later
      version published by the Free Software Foundation.  If the
      Program does not specify a version number of this License, you
      may choose any version ever published by the Free Software
      Foundation.
    </p>

    <p>
      10. If you wish to incorporate parts of the Program into other
      free programs whose distribution conditions are different, write
      to the author to ask for permission.  For software which is
      copyrighted by the Free Software Foundation, write to the Free
      Software Foundation; we sometimes make exceptions for this.  Our
      decision will be guided by the two goals of preserving the free
      status of all derivatives of our free software and of promoting
      the sharing and reuse of software generally.
    </p>

    <br>
    <center>NO WARRANTY</center>

    <p>
      11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
      WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
      LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
      HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
      WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
      BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
      AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS TO THE
      QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
      PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY
      SERVICING, REPAIR OR CORRECTION.
    </p>

    <p>
      12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO
      IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY
      MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE
      LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
      INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
      INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS
      OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
      YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH
      ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN
      ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    </p>

    <br>
    <center>END OF TERMS AND CONDITIONS</center>

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